How to update RHEL 6.2/6.3/6.4/6.5 to RHEL 6.6

Redhat has released its major release of RHEL 6.6 on 14th October 2014, Since from the day of release every one is looking for upgrading the current version to latest RHEL release. This how to is mainly focusing on upgrading previous release of RHEL 6.x to the latest. Before going to update, lets look into the main features in the latest version.